A novel inner bevel edge machining method comprises the following steps: (1) providing a PCB whole board, and arranging a board edge area, a hollow area and an effective area on the PCB whole board; (2) performing groove milling, and milling a function groove in the PCB whole board, and forming a first groove side face and a second groove side face that are in the mirror symmetry on the two sidesof the function groove, wherein the groove width of the function groove gradually retracts from outside to inside, the side face of the second groove is arranged between the side face of the first groove and the edge region of the board, and the function groove is formed in the position, close to the hollow area, of the effective area; (3) hollowing out the board, hollowing out the part of the PCBof the side face of the first groove synchronously while the board is hollow out, so that the base plate forms an inner bevel edge at the side surface of the first groove. The whole machining processof the inner bevel edge machining is carried out on the existing equipment, the special equipment does not need to be purchased independently, the relevant requirements of the bevel edges can be guaranteed, and the production cost of an enterprise is effectively saved.